<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>V Mandelbrot WebAssembly Example</title>
</head>
<body>
	<canvas id="canvas" width="200" height="200" style="width:100%;height:100%;image-rendering: crisp-edges;"></canvas>
	<script>
		var canvas = document.getElementById("canvas");
		var ctx = canvas.getContext("2d");
		var memory;

		function get_string(ptr, len) {
			const buf = new Uint8Array(memory.buffer, ptr, len);
			const str = new TextDecoder("utf8").decode(buf);

			return str
		}

		const env = {
			canvas_x: () => canvas.width,
			canvas_y: () => canvas.height,
			setpixel: (x, y, c) => {
				ctx.fillStyle = "rgba(1,1,1,"+(c/255)+")";
				ctx.fillRect(x, y, 1, 1);
			},
			__writeln: (ptr, len) => {
				console.log(get_string(ptr, len))
			},
			__panic_abort: (ptr, len) => {
				throw get_string(ptr, len);
			}
		}

		WebAssembly.instantiateStreaming(fetch("mandelbrot.wasm"), {env: env}).then((res) => {
			memory = res.instance.exports['memory'];
			
			console.time('main.main')
			res.instance.exports['main.main']()
			console.timeEnd('main.main')
		});
	</script>
</body>
</html>